RFR: 7903727: Remove the reliance on String Templates feature [v5]

[Maurizio Cimadamore]

On Tue, 4 Jun 2024 13:07:51 GMT, Nizar Benalla <nbenalla at openjdk.org> wrote:

>> This was one of the couple of times where I used `MessageFormat`, so I had to escape the `{`
>
> This was one of the couple of times where I used MessageFormat, so I had to escape the {

I presume we can just drop the call to `Message::format` here and keep `appendIndentedLines`, right?

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PR Review Comment: https://git.openjdk.org/jextract/pull/244#discussion_r1625983773